Department of Energy Science and Technology, Smart Living Innovation Technology Center, Myongji University, Yongin, Gyeonggi-do, 17058, Republic of Korea.
Environ Sci Pollut Res Int. 2019 Jan;26(3):2734-2746. doi: 10.1007/s11356-018-3811-3. Epub 2018 Nov 27.
Environmental and health concerns arising from the toxicity of organic dye effluents is still the issue of the twenty-first century. In that regard, this study presents iron sulfide (FeS) for its use in environmental remediation application. Amorphous phase FeS nanowires were synthesized by PVP-assisted solvothermal reaction and were characterized using XRD, XPS, BET, FE-SEM, and EDS techniques. The amorphous phase FeS is attractive from material synthesis point of view as its synthesis does not require delicate control over the process parameters, unlike the crystalline phase. The 1-D nanowire FeS had a high surface-to-volume ratio with negative zeta potential within a wide pH range. Having those surface and microstructural properties, these nanowires exhibited excellent adsorption property towards model organic dyes, Congo red (anionic), and methylene blue (cationic), with theoretical adsorption capacity of 118.86 and 48.82 mg g, respectively. Adsorption kinetics and isotherm models were implemented to study the adsorption processes at different adsorption conditions (pH, adsorbent loading, initial adsorbate concentration). The pH dependence of the adsorption and FT-IR analysis evidenced the prevalence of both physisorption and chemisorption during the adsorption of Congo red. Recyclability test proved the excellent performance of this amorphous FeS nanowire adsorbent for three consecutive cycles. Considering its ease of synthesis, excellent adsorption property, and cyclic performance, the as-prepared adsorbent could be a promising material for dye effluents treatment.
有机染料废水的毒性所带来的环境和健康问题仍然是 21 世纪的问题。在这方面，本研究提出了硫化亚铁（FeS）在环境修复应用中的应用。通过 PVP 辅助溶剂热反应合成了非晶相 FeS 纳米线，并通过 XRD、XPS、BET、FE-SEM 和 EDS 技术进行了表征。从材料合成的角度来看，非晶相 FeS 很有吸引力，因为其合成不需要对工艺参数进行精细控制，这与晶相不同。1-D 纳米线 FeS 具有高的比表面积和在宽 pH 范围内的负 ζ 电位。由于具有这些表面和微观结构特性，这些纳米线对模型有机染料刚果红（阴离子）和亚甲蓝（阳离子）表现出优异的吸附性能，理论吸附容量分别为 118.86 和 48.82 mg g。在不同的吸附条件（pH、吸附剂负载量、初始吸附质浓度）下，实施了吸附动力学和等温线模型来研究吸附过程。吸附和傅里叶变换红外（FT-IR）分析的 pH 依赖性表明，在刚果红的吸附过程中，同时存在物理吸附和化学吸附。可重复使用性测试证明了这种非晶态 FeS 纳米线吸附剂在三个连续循环中的优异性能。考虑到其易于合成、优异的吸附性能和循环性能，所制备的吸附剂可能是处理染料废水的有前途的材料。
